Strong modulations of optical reflectance in tapered core-shell nanowires
Floris, Francesco; Lucia, Fornasari; Vittorio, Bellani; Marini, Andrea; Banfi, Francesco; Marabelli, Franco; Beltram, Fabio; Ercolani, Daniele; Battiato, Sergio; Sorba, Lucia; Rossella, Francesco
Date:
2019-10-31
Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Citation:
Floris, F., Fornasari, L., Bellani, V., Marini, A., Banfi, F., Marabelli, F., Beltram, F., Ercolani, D., Battiato, S., Sorba, L. and Rossella, F. (2019) 'Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires', Materials, 12(21), 3572. (11pp.) doi: 10.3390/ma12213572
Abstract:
Random assemblies of vertically aligned core–shell GaAs–AlGaAs nanowires displayed an optical response dominated by strong oscillations of the reflected light as a function of the incident angle. In particular, angle-resolved specular reflectance measurements showed the occurrence of periodic modulations in the polarization-resolved spectra of reflected light for a surprisingly wide range of incident angles. Numerical simulations allowed for identifying the geometrical features of the core–shell nanowires leading to the observed oscillatory effects in terms of core and shell thickness as well as the tapering of the nanostructure. The present results indicate that randomly displaced ensembles of nanoscale heterostructures made of III–V semiconductors can operate as optical metamirrors, with potential for sensing applications.
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Except where otherwise noted, this item's license is described as © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).